<article class="header">
</article>
<article>
	<div id="allmap"></div>
</article>
<style>
	.header {
		position: relative;
		margin-top: 100px;
	}
	article{
		width: 100%;
		height: 100%;
	}
	#allmap {
		width: 100%;
		height: 100%;
		overflow: hidden;
		margin: 0;
		font-family: "微软雅黑";
	}
</style>